Which conformation might indicate potential vision issues in a horse?

The option indicating potential vision issues in a horse is characterized by the term "pig eyes." This term is used to describe a physical conformation where the horse has a protruding appearance of the eyes, which can be a sign of certain vision problems, such as cataracts or other eye abnormalities. Horses with "pig eyes" may have inherited conditions that can affect their eyesight, potentially leading to impaired vision or susceptibility to eye injuries.

In contrast, the other options, while they describe different conformations, are not directly associated with vision issues. Pigeon toes relate to how a horse stands and moves, specifically concerning the alignment of the legs, which does not impact vision. Goose rumped describes the shape of the horse’s hindquarters and affects balance rather than eyesight. High withers are a structural aspect that can influence saddle fitting and riding posture but do not have a correlation with visual impairments. Therefore, "pig eyes" correctly identifies a conformation that suggests a risk of visual difficulties in horses.